Aprilaire 8551 - Manual (Page 13)

• Temporarily Override the Set Temperature: Press and hold the DECREASE button or
INCREASE button to change the room set-point temperature in 1 degree increments.
The new set-point temperature will be held for 3 hours, then the thermostat will automatically
return to the program.
• Hold a New Temperature Set Point: Press and hold the DECREASE button or INCREASE
button to change the room set-point temperature in 1 degree increments. The new set-point
temperature can be maintained indefinitely by pressing and releasing the HOLD button. The word
“HOLD” will be displayed. The thermostat will maintain this new set-point temperature until the
RESUME button is pressed returning the thermostat to the original program. This procedure is
typically used during extended vacant periods (vacations, business trips, etc.), to hold an economical
set point until you return.
• Returning to Programmed Operation: At any time, press the RESUME button to return the
thermostat to operate as programmed.
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